Micrometer depth-gage



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SPECIFICATION forming part of Letters Patent No. 623,748, dated April 25, 1899.

Application filed March 1, 1899. Serial N0. 707,325. (No model.)

To all whom, it may concern.-

Be it known that I, CLAUDE LIVINGsroNE WALTERS, of Stamford, in the county Of Fairfield and State of Connecticut, have invented a new and Improved MicrometerDepth-Gage, of which the following is a full, clear, and eX- act description.

The object of the invention is to provide a new and improved micrometer depthgage arranged to permit a convenient and direct reading of the depth of a hole, recess, or the like without further mental calculation and without covering up the graduations and also permitting.;` accurate adjustment and readj ustment of the parts in case of wear.

The invention consists of novel features and parts and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

A practical embodiment of myinvention is represented in the accompanying drawings, forming a part of this speciieation, in which similar characters oi' reference indicate corresponding parts in all the views.

Figure lis a side elevation of the improvement. Fig. 2 is a transverse section of the same on the line 2 2 in Fig. l. Fig. 3 is an inverted plan View of the base, and Fig. 4 is a sectional plan View of the improvement on the line 4 4in Fig. 2.

The improved micrometer depth-gage is provided with a base A, on which is formed or secured an upwardly-extending barrel B, formed with an elongated longitudinally-extending slot B/, the side walls of which are provided with a linear graduation B2, as is plainly indicated in Fig. l. On said graduation, B2 indicates the lower edge of an indicator-sleeve C, adapted to pass into the barrel B, and formed on its peripheral surface with a graduation C', the lines of which extend lengthwise of the sleeve, to permit reading of correct measure ment along the graduation B2 of the barrel B. The part of the indicatorsleeve directly above the graduation C is roughened or knurled, as at C2, to permit the operator to conveniently turn the sleeve for making the desired measurement, as hereinafter more fully described.

A rod D is centrally secured in the indicator-sleeve C by means of a clamping-nut E, screwing on the upper split and threaded end C2 of the sleeve C. The latter is provided in its lower portion with an internal screwthread C4, screwing on the thread F' of a spindle F, secured or formed on the base A and extending concentrically within the barrel B, sufficient space being allowed between the barrel and the spindle to permit the passage of the indicator-sleeve into the barrel around the sleeve.

In order to take up backlash of the indicator-sleeve C on the threaded end of the spindle, I prefer to split the upper end thereof and screw into this split end a conical eX- panding-n ut G, which forces the split portions sufficiently outward into firm contact with the corresponding threads C4 to take up the backlash.

The ends of the rod D are pointed, as at D', and said rod extends through a central bore-in the sleeve F and the base A, the lower end of the lower point D being ilush with the under surface of the base at the time the lower edge of ,the sleeve C stands at zero on the graduation B2, the zero-mark and the graduation C being in alinement with the side wall of the slot B, carrying the graduation B2.

It is evident that when a full turn is given to the sleeve C it screws downward on the spindle F to bring its lower edge to the second mark on the graduation B2, thus indicating when the twenty-five thousandth of an inch has been measured, as the graduation C indi- Cates twenty-tive one-thousandths of an inch marked off on the peripheral surface of the sleeve.

It will be seen that by the arrangement described the graduation C appears in the slot B', and hence the user of the device can readily read the accurate measurement along the graduation B2 and the graduation C', as both are visible, and no part of the graduation B2 is covered up as the sleeve O passes into the barrel B.

The base A is formed with transversely-extending recesses A', having tapering walls leading with their inner apex ends to the central bore in the base A, so that light can readily pass down to the point D to permit the operator to see when the point touches the bottom or the depth to be measured.

In case the point D is somewhat worn IOO ready adjustment of the rod D in the indicator-sleeve C can be had by the operator unserewing the clamping-nut E to permit of sliding the rod D in the sleeve the desired distance tocompensate for the amount worn off at the pointD. Vhen this has been done, the nut E is again screwed up to securely clamp the rod l) in position on the sleeve C. In a like manner the rod D can be adjusted to bring its pointanydesired distance beyond the base A at the time the zero-marks of both graduations C and B2 are in register to allow of measuring greater depth than that indicated by the aggregate length of the graduation B2.

From the foregoing it is evident that they gage is very simple in construction, can be cheaply manufactured, is not liable to get out of order, and permitsa convenient measuring and reading of the dept-h of a hole or recess or a like calculation and without covering up the graduations, as is so frequently the case in micrometer-gages as heretofore constructed. Furthermore, the rod D can be readily adjusted in the sleeve C to compensate for wear or to allow of making larger measurements than indicated by the graduation Bi". Any backlash can be readily taken up by the operator adjusting the expandingnut G.

Having thus fully described my invention, Ielaim as new and desire to secure by Letters Patentl. A micrometer-gage, having a base capable of hearing non-movably upon the object to be measured, a fixed threaded micrometerspindle mounted on the base, a barrel fixed to the base and inclosing vthe spindle, and an indicator-sleeve screwing on the spindle and sliding within the barrel, between the same and the spindle.

2. A micrometer-gage, comprising a base, a fixed threaded micrometer-spindle on said base, a barrel fixed to the base and concentric to said spindle to leave an annular space between the spindle and the barrel, an indicator-sleeve screwing on said spindle and adapted to pass into the space between the spindle and the barrel, and a rod adjustably secured t0 said sleeve, and extending through a bore in said spindle and said base, as set forth.

3. A micrometer-gage, comprising a base, a barrel carried thereby and formed with an elongated longitudinally-extending slot, the side walls of which are formed with a graduation, a screw-threaded spindle extending concentrically in said barrel and fixed to the base, and an indicator-sleeve screwing on said spindle, and arranged to pass into said barrel, to permit ot bringing the peripheral graduation of the sleevein register with said graduation on the barrel, and an expandingnut screwing in the upper, split end of said spindle, for taking up backlash between the spindle an d the sleeve, substantially as shown and described.

4. A micrometer-gage, provided with a base having a central bore for the passage of a measuring-rod, the bottom of the base being formed with recesses extending transversely and having tapering walls, and leading with their inner, apex ends to the bore for said rod, substantially as shown and described.

CLAUDE LIVINGSTONE WATERS.

Witn esses:

JAMES R. FLETCHER, HARRY N. SMITH. 

